Voltage Drop - NOT Park Problem

BB_TX wrote:
Seems no one is actually reading thru the original post. :B

OK smarty..

Here is the first post the OP posted.

ThruTraffic wrote:
Phoenix Cruiser 2551 30a service

- First noticed it when A/C turns on then stumbles. Voltage at another RV outlet dropped well below 100. Capacitors good. A/C working fine until this point. A/C did trip ITS 20a breaker one time. 30a main held.
- Problem persists when disconnected from shore power and generator running. Main indicator this is an RV wiring problem not shore power delivery system.
- Thermostat threw an E1.
- Inverter monitor behind driver seat threw an E2 and E5.
- Can turn on toaster at one outlet voltage drops 3v
- Can turn on hot water heater voltage drops 3v
- Hooked up a 15a draw elect device drops 5v
- System wide problem
- Checked connections at transfer switch, socket for shore power, junction where old EMS used to be, mains in RV breaker panel. Checked neutrals, grounds and feeds. All tight.

Shore power is my RV lot shop. I can find no voltage issues there even under load. Problem is on the load side of the RV sidewall shore power connector. Even tried different cables and installed a new 30a breaker.

Am I missing any 120v main connections in the RV not listed above?

I’m stumped.

Absolutely where does the OP state that they checked VOLTAGES at every point I mentioned under load?

The OP only mentioned "checking" the connections and pronounced them good.

Checked them as in how?

Voltages?

Doubtful.

Looks?

Most likely, they mentioned the connections are "tight" which means they used a screw driver to see if any of the connections were "loose". Just because a connection is tight, doesn't mean it is electrically good.

You can have a "good looking" connection but yet have a poor electrical connection.

Op basically gave zero info that is helpful, no T stat brand and model, no inverter brand and model and all of the error codes are most likely some error stemming from low line voltage due to a bad connection in the 120V wiring.

If the problem is persistent across two or more electrical sources then you must go to the the common point where all electrical sources are tied in together.

Common points are EMS (if equipped), the place where EMS used to be (if removed), breaker panel and ATS.. Those are the first places to check in and out voltages. Checking voltage at an outlet is not the right place to start..